Picked this up recently as I thought it was just cool. 3.75x5.5 RRPC from 1933.
Since it was mailed from DC I'm assuming this is from the first game of a double header that happened on May 31st against Washington that Ruffing pitched (postcard was mailed on 6/9).
He lost the game so maybe he should have been more concentrated on warming up rather than the guy taking the photo of Ruth.